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In this paper, an efficient search center definition algorithm is proposed for H.264/AVC. H.264/AVC achieved high coding efficiency by introducing some new coding tools including a new definition of the search center. However, the definition of the search center is not efficient in the case of significant motions. This work proposes some new search center candidates using spatial and temporal correlations...
Macroblock level Horizontal Spatial Prediction(HSP) based intra frame coding scheme for High Dimension(HD) video sequences was proposed in this paper. According to the correlation experiment on HD sequences, most HD pictures have the stronger horizontal spatial correlation than the vertical spatial correlation, about 2dB stronger. This phenomena drop a valuable hint to us that the horizontal spatial...
In H.264/advanced video coding, the encoder employs the rate-distortion optimization (RDO) to select the optimal coding mode of each block. Although it is effective to employ the RDO technique for mode decision, the computation load increases drastically. To reduce the computation complexity of the RDO technique, in this paper, we propose efficient algorithms for the estimation of block-level rate...
Region-of-interest (ROI) can be applied in H.264 video encoder to enhance subjective quality and reduce computation complexity. For the aiming application of low cost hardware real-time encoder in videophone with faces as ROI, this paper proposes a face detection algorithm to detect each macroblock (MB) as one part of a face or not. This face detection algorithm has a unique estimation-and-verification...
This paper proposes two efficient frame selection methods to improve rate distortion performance and to reduce the computation complexity for frame selection. The proposed Reference Selection Pass (RSP) method can simplify early termination conditions by using the results of the previous coded blocks. The improved frame selection (IFS) method controls the number of reference frames according to the...
In inter-frame coding of H.264/AVC standard, there are inter partition modes and intra modes to be taken into account for seeking best mode. Although it can achieve higher coding efficiency than any other previous coding standard, the computation complexity also increases significantly. In this work, based on the information of the histogram differences and rate part of rate-distortion optimization,...
Intra coding in H.264/AVC has significantly enhanced the video compression efficiency. However, computation complexity increases due to the rate-distortion (RD) based mode decision. This paper proposes a new fast mode decision algorithm in H.264/AVC intra prediction and its VLSI architecture. A new edge-detection pattern is proposed and both edge-detection technique and spatial mode prediction technique...
Seven variable block sizes are adopted for inter-frame MB (macroblock) coding in H.264. This new feature achieves significant coding gain. However, the computation complexity of the mode decision is extremely high when RD (rate distortion) algorithm is used. In this paper, we propose a fast mode decision algorithm with fast coding block size selection based on MB motion characteristic for inter frames...
In H.264/AVC video coding standard, rate distortion optimization (RDO) is a very efficient technique to decide the coding mode of the macroblock and improves the coding performance greatly. But at the same time, RDO introduces a great deal of computation complexity because it needs to do the transform and entropy coding to get accurate distortion and bit-rate to calculate the Lagrange cost. In order...
Transcoding is a fast and elegant solution for the adaptation of video content. In the case of bitrate adaptation, an important technique is requantization transcoding. In this paper, we extend our previous work, that focused on requantization of intra-coded pictures, to P and B pictures. We show that by using a combination of techniques, depending on the slice and macroblock type, improved results...
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